Abstract [en]

In the present study, the particle number and mass size distributions from two measurements on steam and oxygen blown atmospheric bubbling fluidised bed (ABFB) gasification (20 kW) of wood pellets are presented. The total particle number concentration determined using a scanning mobility particle sizer (SMPS) varied between 5.1x10^5-6.6x10^6 particles/cm3 (mobility equivalent diameter (dB) 10-670 nm), with the largest variation for particles with dB<100 nm. The particle number size distributions were bimodal with modes at 20-30 nm and at 260-410 nm. The particle mass concentrations determined using a low pressure impactor (LPI) varied between 60-310 mg/m3 for particles with aerodynamic diameter (dae)<5 µm, with modes at 0.2-0.3 µm and at 2-3 µm.